Some avi videos has sound distort or sincro. problems

Some avi videos I play on 42PFL7676 witrh the usb from a external hard disk (not a multimedia disk) with the last sofware update sounds really bad, always the music. The music sounds like the player jumps audio signal to one in two miliseconds
(or something like this, I try to explain how it sounds). It is no a clear music sound
Another times, I have a stop on undeterminated fotogram (almost always at 30 minutes aprox.) I have to turn off my TV....

It does not happen with a samsun-led purchased on 2010..... An this movies are recorded on 2011 ....
Any idea ? Philips official 'chat' agent tells me that 'Your TV has not fails. It is not expected to apply
any improvement in this field' ????????
Someone has similar problems ?
Have I to buy another device ? Maybe a blueray ( I have not) ?
Thanks

This examples shows a 'reverberation'.
The effect also can be described as "sound player" plays 0.1 seconds, stop 0.1 seconds, P 0.1, S 0.1, etc
This effect happens at any point of the movie ( at the beggining, in the middle, at the final... )

I have (remember) another problem with other films (with a similar format, I'm affraid) . In these, the sounds little by little is going to de-sincrhonize with the image. At 10 or 15 minutes of playing, I have 1 second or more betwen I see the actors talk and the moment I listen it....
Thanks.

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